Liquid-cooled lamp



me. my w43, W, A, BOURNE ETAL 2,336,525

LIQUID-GOOLED LAMP Filad Deo. 6, 1940 Irwewkor: William A. Bourne HelH rb W. B. Gevdne',

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Patented Dec. 14, 1943 UNITED 'STATES PATENT OFFICE LIQUID-COOLED LAMP New York Application December 6, 1940, Serial No. 368,916 In Great Britain December 18, 1939 (Cl. Mil-11.4)

3 Claims.

This invention relates to fluid cooled lamps of the high vapor pressure type wherein the envelope through which the discharge passes, the vessel surrounding it through which the coolant ows during operation, and terminals adapted to be connected to an electric supply for operating the lamp all form, in the operating condition of the lamps, rigidly interconnected parts of a single structure.

The object of the invention is to provide a lamp of this kind which is demountable, that is to say, which is such that the discharge envelope can be removed from the lamp and replaced by another similar envelope, without breaking any joint that is not adapted by its nature to be broken. Screwed joints are typical of joints adapted to be broken; soldered or welded joints are typical of joints not adapted to be broken.

According to the invention a lamp of the type specified comprises as essential parts- (1) A tubular discharge envelope having at each end a terminal adapted to be brought into adequate contact with a suitable elastic contact member by relative motion between the envelope and the contact member parallel to the axis of the tubular envelope, and having also at one end an electrically insulating portion intervening between the said terminal at that end and the portion of the envelope through which the discharge passes, which insulating portion is adapted either to make a liquid-tight junction with a suitable face of a rigid body when forced against it or to carry a washer which, when forced against the said insulating portion on one side and against a said face on the other, makes a liquidtight junction between the said insulating portion and the said face.

(2) A jacket or casing having a central portion which over at least a part of its circumference is transparent and two end portions, of which end portions one has (a) apertures through which liquid is adapted to enter and leave the casing, (b) one or more baffles constraining the liquid in its passage between the said apertures to flow along the surface of the tubular envelope when it is in the casing, (c) one or more elastic contact members, suitable as aforesaid under (l), connected to an external terminal, and of which end portions the other has (d) a portion removable so as to expose an aperture through which the discharge envelope can be introduced into the casing, (e) one or more elastic contact members, suitable as aforesaid under (1), connected to an external contact member, and (f) means for exerting force on the said insulating portion (in the rst of the said alternatives) or the said Washer (in the second of the said alternatives) so that a liquid-tight junction is made between the said insulating portion and the said other end portion. All the said essential parts are constructed and arranged so that, when the discharge envelope has been introduced into the casing through the said aperture, it is possible to close the said aperture, to make one terminal on the envelope to contact with the contact member c and the other to contact with contact member e, and to make a liquid-tight junction between the said insulating portion and the said other end portion of the casing so that liquid entering and leaving as aforesaid cannot reach any part in electrical Contact with the contact member e.

In the drawing accompanying and forming part of this specification two embodiments of the invention are shown in which:

Fig. l is a side elevational, partly sectional view of one embodiment of the invention and Fig. 2 is a similar view of one end of another embodiment of the invention.

Referring to Fig. 1, the tubular discharge envelope I of vitreous material, such as glass or quartz, carries at one end a cylindrical terminal 2, connected to one electrode within the envelope and at the other a cylindrical body 3 of insulating material within which passes a lead connecting the other electrode within the envelope to a cylindrical terminal 4 on the end of the insulating portion remote from the envelope.

The central part of the casing consists of the glass cylinder 5 which is ultraviolet ray transmitting, when desired, joined at each end by a glassto-metal joint to a metal ring 6 or 1 to which the end portions of the casing are fixed.

The end portion which is lower in the drawing is the rst end portion aforesaid. It consists of an outer portion 8, prolonging the ring 6, and an inner tube 9 connected by the annular perforated plate I0. and 9 is one of the said apertures a, the lower end of 9 the other. The inner tube 9 is prolonged by a glass tube Il (which is the said baffle b), so that water entering the gap between 9 and It and passing through the perforated plate li) iiows rst on the outside of the tube II and then (since the other end of the central portion is blocked by the other end portion) back through the interior of the tubes 9 and Il. The discharge envelope is inside these tubes and hence the water flows along its surface. On the The annular gap between 8 are the said contact members c; they Contact with the terminal 2 which is introduced between them by motion of the envelope I parallel to its axis. Since the parts 8, 9, Il! are all of metal, the contact members are electrically connected to 8; 8, or any metal member connected to it, is the external terminal of the lower end portion.

These parts 8, 9, I0, II, I2 of the end portion may be all permanently connected together; for it is not necessary to separate them in the use of the lamp. But, of course, some of them may be screwed together as indicated in the drawing. The lower external surface of 8 carries a thread 2`I so that there may be attached to it a member (not shown) carrying tubes by which the inside of 9 is connected to the waste outlet preferably by means of a tube fitting within 9, and the gap between 8 and 6 is connected to the water supply. This member is not an essential feature of the invention. If it is present, as it usually will be, it might be permanently fixed to the end portion. When desired, the gap between 8 and 9 is connected to the waste outlet and the inside of 9 to the water supply.

The upper end portion consists of the outer member I3 prolonging the ring I and having on the inner surface of its upper end a thread into which screws the annular nut I4, which is the said removable portion d. Within the end portion is the hollow cylinder I5 prolonged at its upper end by a metal block I6, integral with the cylinder and carrying a terminal I'I which is the external terminal of this end portion. The block I6 passes through the centre of the annular nut Il; and this nut, when screwed home, bears on the shoulder between the top of the cylinder I5 and the block I6, pressing the cylinder downwards. I8 is a short cylinder of relatively thin metal terminated below by the inwardly directed flange I9 and above by the outwardly directed flange 20. The insulated portion 3 passes through the center of the flange I9; a rubber washer 2| is placed between the upper portion of 3 and the cylinder I 8. Under the flange is another rubber washer 22 interposed between the flange and an inwardly directed flange 23 of the member I3. When the cylinder I5 is forced downwards its lower end bears on the upper surface of the washer 2I compressing it between the cylinder I3 and the insulated portion 3, so that the insulated portion is gripped firmly and at the same time a water-tight junction is made, preventing water from reaching the interior of the cylinder l5. The washer 22 is also compressed between the flanges 2B and 23, so that a water-tight junction is made preventing water from reaching the outside of the cylinder I5. The cylinder I5 in conjunction with the nut Ill is therefore the said means f.

The elastic contact members (3) are the leaf springs 24 fixed to the underside of the block I6 and making contact with the terminal 4 between them.

In assembling the lamp, the insulating portion 3 is first passed through the flange I9 and the washer 2| put in position. In order that the lamp may be adjusted correctly in the longitudinal direction, the insulated portion may conveniently carry a ring 25 acting as a stop preventing the insulating portion passing too far through the flange 20. The washer 22 is then placed on the flange 23, and the cylinder I8, carrying the discharge envelope is introduced into the open end of the member I3, so that the flange 2'@ rests on the washer 22, and the terminal 2 enters between the contact members I2. The cylinder I5 is then introduced, so that its lower end rests on the washer 2| and the terminal 4 enters between the contact members 24. The nut I4 is then screwed home and renders everything water-tight and rigid as already indicated.

Fig. 2 shows only part of the alternative embodiment. Corresponding parts are represented in the two figures by the same numerals. rPhe insulating portion 3' is now of rubber and has now a flange 26. The cylinder I5', somewhat diiferently shaped forces the edge of this flange into contact with the flange 23 and thus forms a water-tight joint between the insulated portion 3' and the upper end portion. Parts I8, I 9, 20 and the washers 2I and 22 are no longer required, but the lower part of the insulating portion 3 is covered with a metal sheath 28 to protect it from ultra-violet radiation; this sheath serves no mechanical purpose. The ring 25 is also no longer necessary, because the envelope is located longitudinally by the bearing of the flange 25 or the flange 23. The nut I 4 is shown screwing onto an exterior thread, instead of into an interior thread, as in Fig. 1. The opposite end of the embodiment of Fig. 2 is the same as that shown in Fig. 1.

What we claim as new and desire to secure by Letters Patent of the United States is:

1. In combination, a liquid cooled electric lamp comprising a tubular envelope having at one end thereof a first contact terminal and having at the other end a second terminal and also a base member of resilient rubber intervening between the said second terminal and the envelope; and a liquid cooling jacket surrounding the lamp and having an inlet and outlet for flow of water therein around the lamp envelope, a fixed socket located within and fastened to one end of said jacket for gripping said first terminal upon insertion of the lamp therein through an opening in the other end of the jacket, and closure means at the said other end of the jacket gripping the said resilient base member and making a watertight junction therewith and closing-0H the said second contact terminal from the coolant space in the jacket, said closure means being removably secured to the said other end of the jacket.

2. In combination, an electric lamp having a tubular envelope with a terminal contact member at one end thereof and a second contact member at the other end thereof spaced from the adjacent end of the envelope by a base member of insulating material, and a liquid cooling jacket comprising spaced, concentric outer and inner glass sleeves surrounding the lamp envelope and forming together with the lamp envelope annular, concentric, connected passages for the liquid, said inner sleeve being totally enclosed in said jacket, and metal end portions, the metal end portion adjacent the first lamp contact member comprising outer and inner metal sleeves fused at their edges to the adjacent edges of the corresponding glass sleeves, forming continuations thereof and serving as inlet and outlet passages for the cooling liquid, socket spring fingers mounted within and permanently fastened to the inner metal sleeve and shaped to grip the said rst lamp Contact terminal, the end portion of the jacket adjacent the second lamp contact member comprising a metal sleeve fused at its edge to the adjacent edge of the outer glass sleeve and forming a continuation thereof, a threaded member fastened to said sleeve and having an inner shoulder, an annular nut for engaging with said threaded member, a

hollow cylindrical member having socket spring iingers disposed therein and a terminal at its external, closed end, said cylindrical member having an external shoulder for engagement with said annular nut which is arranged to press said cylindrical member into said jacket, a shorter cylindrical member having open flanged ends extending in opposite directions, the inwardly extending langed end constituting a stop for the movement of said hollow cylinder andhaving an opening for accommodating the insulating base member of said lamp, the outwardly extending iianged end of said shorter cylinder overlapping the inner shoulder of said threaded member, an annular resilient washer disposed between said outwardly extending flanged end and said shoulder and a similar washer disposed between said inwardly extending hanged end and the open end of said hollow cylinder and between the base member of said lamp and said shorter cylinder, said washers being compressed between said elements when said nut is turned in one direction on said threaded member to make a liquid tight junction between said lamp and said jacket and to support said lamp in said jacket with the terminals thereof in engagement with said spring finger members.

i3. In combination, an electric lamp having a tubular envelope with a terminal Contact member at one end thereof and a second contact member at the other end thereof spaced from the adjacent end of the envelope by a base member of resilient insulating material, and a liquid cooling jacket comprising spaced, concentric outer and inner glass sleeves surrounding the lamp envelope and forming together with the lamp envelope annular, concentric, connected passages for the liquid, said inner sleeve being totally enclosed in said jacket, and metal end portions, the metal end portion adjacent the rst lamp contact member comprising outer and inner metal sleeves fused at their edges to the adjacent edges of the corresponding glass sleeves, forming continuations thereof and serving as inlet and outlet passages for the cooling liquid, socket spring iingers mounted within and permanently fastened to the inner metal sleeve and shaped to grip the said rst lamp contact terminal, the end portion of the jacket adjacent the second lamp contact member comprising a metal sleeve fused at its edge to the adjacent edge of the outer glass sleeve and forming a continuation thereof, a threaded member fastened to said sleeve and having an inner shoulder, an annular nut for engaging with said threaded member, a hollow cylindrical member having socket spring fingers disposed therein and a terminal at its external, closed end, said cylindrical member having an external shoulder for engagement with said annular nut which is arranged to press said cylindrical member into said jacket, said lamp base member being disposed between the inner shoulder of said threaded member and one end of said cylindrical member and being compressed between these elements when said nut is turned in one direction on said threaded member to make a liquid tight junction between said lamp and said jacket and to support said lamp in said jacket with the terminals thereof in engagement with said spring fingers.

WILLIAM A. BOURNE. HERBERT W. B. GARDINER. 

